| Trading Agents Group | N | Mean | Std. Deviation | Std. Error | 95% Confidence Interval for Mean | Min. | Max. | |
| Lower Bound | Upper Bound | |||||||
| Traders (Importers, Exporters) | 49 | 3.7816 | 0.34198 | 0.04885 | 3.6834 | 3.8799 | 3.10 | 4.50 |
| Transporters | 30 | 4.0167 | 0.41447 | 0.07567 | 3.8619 | 4.1714 | 3.20 | 4.80 |
| Freight forwarders | 30 | 4.0033 | 0.31126 | 0.05683 | 3.8871 | 4.1196 | 3.30 | 4.60 |
| Clearing Agents | 30 | 3.9033 | 0.30567 | 0.05581 | 3.7892 | 4.0175 | 3.50 | 4.80 |
| Total | 139 | 3.9065 | 0.35635 | 0.03023 | 3.8467 | 3.9662 | 3.10 | 4.80 |